But schools also try to fight the problem of drug use themselves.At the beginning of 2005 a British state school has introduced for the first time random drug testing.Students from a school in Kent will have mouth swabs (棉签) taken to discover drug use.Each week 20 names will be selected by computer and the swabs sent off to a drug testing laboratory.Results will be available three days later.The school' s head teacher says that no child will be tested against his or her wishes.Children who test positive will not be forced to leave the school, but those who sell drugs will.
45.From the surveys, we learn that in Europe only the UK has the highest number of ______.
A.the teenagers who have used cocaine
B.the 15 -year -olds who have tried cannabis
C.the girls who have been addicted to drinking
D.the boys who have tried illegal drugs at least once
Addiction, two in five 15 - year - olds in the UK have tried cannabis(大麻).This number is higher than anywhere else in Europe46.What can be inferred according to the passage?
A.The UK has the highest number of drug users.
B.Drug sellers use students to sell drugs for them.
C.British police can't give people blood tests for drugs.
D.Any student will be given drug tests whether he likes it or not.Drug sellers working near a school or using children to help sell drugs will face tougher penalties (处罚).47.What does the underlined phrase "random drug testing" in the last paragraph mean?
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